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Discussion :: GATE Metallurgical

  1. A steel specimen containing 0.2 wt.% C is carburized in an atmosphere that maintains a carbon content of 1.2 wt.% C at the surface of the specimen. 
    Given: For carbon diffusion in austenite: D0=2.0×10-5 m2/s 
    Activation energy for diffusion, Q=142 kJ/mol

    What is the depth (in μm) from the surface of the specimen at which a composition of 0.4 wt.% C is obtained after carburizing at 870°C for 10 h?
    2. A.
    15
    B.
    84
    C.
    113
    D.
    875

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    Workspace

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    Answer : Option D

    Explanation :

    -NA-

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